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/*
Unix SMB/CIFS implementation.
Database Glue between Samba and the KDC
Copyright (C) Guenther Deschner <gd@samba.org> 2014
Copyright (C) Andreas Schneider <asn@samba.org> 2014
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/kerberos.h"
#include "sdb.h"
#include "samba_kdc.h"
#include "lib/krb5_wrap/krb5_samba.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_KERBEROS
void sdb_key_free(struct sdb_key *k)
{
if (k == NULL) {
return;
}
/*
* Passing NULL as the Kerberos context is intentional here, as
* both Heimdal and MIT libraries don't use the context when
* clearing the keyblocks.
*/
krb5_free_keyblock_contents(NULL, &k->key);
if (k->salt) {
smb_krb5_free_data_contents(NULL, &k->salt->salt);
SAFE_FREE(k->salt);
}
ZERO_STRUCTP(k);
}
void sdb_keys_free(struct sdb_keys *keys)
{
unsigned int i;
if (keys == NULL) {
return;
}
for (i=0; i < keys->len; i++) {
sdb_key_free(&keys->val[i]);
}
SAFE_FREE(keys->val);
ZERO_STRUCTP(keys);
}
void sdb_entry_free(struct sdb_entry *s)
{
if (s->skdc_entry != NULL) {
s->skdc_entry->db_entry = NULL;
TALLOC_FREE(s->skdc_entry);
}
/*
* Passing NULL as the Kerberos context is intentional here, as both
* Heimdal and MIT libraries don't use the context when clearing the
* principals.
*/
krb5_free_principal(NULL, s->principal);
sdb_keys_free(&s->keys);
SAFE_FREE(s->etypes);
sdb_keys_free(&s->old_keys);
sdb_keys_free(&s->older_keys);
if (s->session_etypes != NULL) {
SAFE_FREE(s->session_etypes->val);
}
SAFE_FREE(s->session_etypes);
krb5_free_principal(NULL, s->created_by.principal);
if (s->modified_by) {
krb5_free_principal(NULL, s->modified_by->principal);
}
SAFE_FREE(s->valid_start);
SAFE_FREE(s->valid_end);
SAFE_FREE(s->pw_end);
SAFE_FREE(s->max_life);
SAFE_FREE(s->max_renew);
ZERO_STRUCTP(s);
}
/* Set the etypes of an sdb_entry based on its available current keys. */
krb5_error_code sdb_entry_set_etypes(struct sdb_entry *s)
{
if (s->keys.val != NULL) {
unsigned i;
s->etypes = malloc(sizeof(*s->etypes));
if (s->etypes == NULL) {
return ENOMEM;
}
s->etypes->len = s->keys.len;
s->etypes->val = calloc(s->etypes->len, sizeof(*s->etypes->val));
if (s->etypes->val == NULL) {
SAFE_FREE(s->etypes);
return ENOMEM;
}
for (i = 0; i < s->etypes->len; i++) {
const struct sdb_key *k = &s->keys.val[i];
s->etypes->val[i] = KRB5_KEY_TYPE(&(k->key));
}
}
return 0;
}
/*
* Set the session etypes of a server sdb_entry based on its etypes, forcing in
* strong etypes as desired.
*/
krb5_error_code sdb_entry_set_session_etypes(struct sdb_entry *s,
bool add_aes256,
bool add_aes128,
bool add_rc4)
{
unsigned len = 0;
if (add_aes256) {
/* Reserve space for AES256 */
len += 1;
}
if (add_aes128) {
/* Reserve space for AES128 */
len += 1;
}
if (add_rc4) {
/* Reserve space for RC4. */
len += 1;
}
if (len != 0) {
unsigned j = 0;
s->session_etypes = malloc(sizeof(*s->session_etypes));
if (s->session_etypes == NULL) {
return ENOMEM;
}
/* session_etypes must be sorted in order of strength, with preferred etype first. */
s->session_etypes->val = calloc(len, sizeof(*s->session_etypes->val));
if (s->session_etypes->val == NULL) {
SAFE_FREE(s->session_etypes);
return ENOMEM;
}
if (add_aes256) {
/* Add AES256 */
s->session_etypes->val[j++] = ENCTYPE_AES256_CTS_HMAC_SHA1_96;
}
if (add_aes128) {
/* Add AES128. */
s->session_etypes->val[j++] = ENCTYPE_AES128_CTS_HMAC_SHA1_96;
}
if (add_rc4) {
/* Add RC4. */
s->session_etypes->val[j++] = ENCTYPE_ARCFOUR_HMAC;
}
s->session_etypes->len = j;
}
return 0;
}
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